MOLECULES
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2022
·Vol. 27
·期 22
·8037
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IF 4.927
Xiaoyu Guan,Juntao Guo,Hui Zhang,Shiyong Tao,Gilles Mailhot,Feng Wu,Jing Xu
The adsorption of antibiotics on minerals is an important process in their environment behavior. The adsorption behavior of antibiotics on iron-containing minerals and the effect of co-existing cations and anions were studied in this work. Magnetite, hematite, goethite and kaolin were selected as the representative minerals and characterized by SEM, XRD and BET. A total of eight antibiotics, including three quinolones, three sulfonamides and two mycins were chosen as the research targets. Results showed a higher adsorption amount of quinolones than that of sulfonamides and mycins on the surface of iron-containing minerals in most mineral systems. The adsorption isotherms of quinolones can be well fitted using the Freundlich models. The effects of five cations and five anions on the adsorption of quinolones were investigated, among which Mg2+, Ca2+, HCO3−and H2PO4−mainly showed significant inhibition on the adsorption, while the effects of K+, Na+, NH4+, Cl−, NO3−and SO42−showed less. Natural surface water samples were also collected and used as media to investigate the adsorption behavior of quinolones on iron-containing minerals. The buffering capacity of the natural water kept the reaction solution at circumneutral conditions, and the adsorption amount was mostly promoted in the goethite system (from 0.56~0.78 μmol/g to 0.52~1.43 μmol/g), but was inhibited in the other systems (magnetite: from 1.13~1.33 μmol/g to 0.45~0.76 μmol/g; hematite: from 0.52~0.65 μmol/g to 0.02~0.18 μmol/g; kaolin: from 1.98~1.99 μmol/g to 0.90~1.40 μmol/g). The results in this work help to further understand the transportation and fate of antibiotics in an aqueous environment.Keywords:antibiotics;iron-containing minerals;adsorption;co-existing ions;natural surface water
研究领域:
环境科学
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化学
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矿物学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Maocai Shen,Biao Song,Guangming Zeng,Yaxin Zhang,Fengyun Teng,Chengyun Zhou
The impact of surfactant addition on the adsorption performance of lead ion (Pb 2+ ) as a typical heavy metal ion on three microplastics was investigated. The types of microplastics (polyethylene (PE), polypropylene (PP) and polymethylmethacrylate (PMMA)) and surfactants (triton X-100 (TX-100), 1-hexadecylpyridinium bromide (HDPB), and sodium dodecyl benzenesulfonate (SDBS)), adsorption time, concentration of Pb 2+ , and coexisting ions was systematically investigated, and the characteristics of adsorption of Pb 2+ by microplastics were analyzed. The experimental results showed that the adsorption capacity of Pb 2+ on three micropalstics was different. The adsorption capacity of Pb 2+ on the three microplastics without surfactants was: 4.21 (PMMA) > 2.01 (PE) > 1.57 mg g −1 (PP). The addition of surfactants resulted in a higher hydrophilicity of microplastics, and obviously improved the adsorption ability of microplastics for lead ions. SDBS can significantly enhance the adsorption of Pb 2+ on three microplastics compared with other two surfactants (TX100 and HDPB). The highest adsorption capacity of Pb 2+ on the three microplastics with addition of SDBS solution was: 7.87 (PMMA) > 7.20 (PE) > 7.02 mg g −1 (PP). With the increase of adsorption time and Pb 2+ concentration, the adsorption efficiency of microplastics for Pb 2+ first increased and then decreased. The pH of solution had a great influence on the adsorption of Pb 2+ by microplastics. The results of coexisting ion experiments demonstrated that when lead ion and copper ion coexist, the two ions have competitive adsorption phenomenon on PP. This research explored the adsorption characteristics of lead ions by microplastics with addition of surfactants, which can provide theoretical basis for further study of heavy metal enrichment and environmental behavior of microplastics in the environment.
研究领域:
环境科学
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化学
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DOI
高影响因子
CHEMOSPHERE
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2021
·
IF 7.086
Dongxue Liu,Ye Li,Chang Liu,Yuzhi Zhou
A nanocomposite of a zirconium-based metal-organic framework (UiO-66) @ polypyrrole (PPy) (UiO-66@PPy) was successfully synthesized to eliminate F − from groundwater. The optimum initial pH and adsorbent dose for maximum uptake of F − from aqueous solution were found to be 3.0 and 0.1 g/L, respectively. The fluoride removal performance of UiO-66 was greatly enhanced through the introduction of polypyrrole guests, and the maximum adsorption capacity of UiO-66@PPy, namely, 290.7 mg/g, was reached, which is far superior to those of other previously reported adsorbents. The fluoride adsorption by UiO-66@PPy agreed well with the pseudo-second-order equation model and Langmuir isotherm model. The coexisting PO 4 3− and CO 3 2− substantially influence fluoride removal. The synthesized UiO-66@PPy could be reused five times in adsorption-desorption cycles. The incorporation of conducting polymers opened additional paths for the development of adsorbent materials; thus, UiO-66@PPy could be a viable adsorbent material and contribute to fluoride removal from groundwater.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHEMOSPHERE
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2016
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IF 3.698
Hongyu Wang,Yibing Liu,Jia-Qian Jiang
This paper investigates the degradation of acetaminophen (AAP) in aqueous solutions by ferrate (VI), aiming to propose the kinetics, pathways and the oxidation products’ formation in the AAP degradation. A series of jar tests were undertaken over ferrate (VI) dosages (molar ratios of ferrate (VI):AAP, 5:1 to 25:1) and pH values (4–11). The effects of co-existing ions (0.2–5 mM) and humic acid (10–50 mg l −1 ) on the AAP removal were investigated. Ferrate (VI) can remove 99.6% AAP (from 1000 μg l −1 ) in 60 min under study conditions when majority of the AAP reduction occurred in the first 5 min. The treatment performance depended on the ferrate(VI) dosage, pH and the type and strength of co-existing ions and humic acid. Raising ferrate (VI) dosage with optimal pH 7 improved the AAP degradation. In the presence of humic acid, the AAP degradation by ferrate (VI) was promoted in a short period (<30 min) but then inhibited with increasing in humic acid contents. The presence of Al 3+ , CO 3 2− and PO 4 3− ions declined but the existence of K + , Na + , Mg 2+ and Ca 2+ ions can improve the AAP removal. The catalytic function of Al 3+ on the decomposition of ferrate (VI) in aqueous solution was found. The kinetics of the reaction between ferrate (VI) and AAP was pseudo first-order for ferrete (VI) and pseudo second-order for AAP. The pseudo rate constant of ferrate (VI) with AAP was 1.4 × 10 −5 L 2 mg −2 min −1 . Three oxidation products (OPs) were identified and the AAP degradation pathways were proposed.
研究领域:
环境科学
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化学工程
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药学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Weiying Li,Li Liang,Yue Li,Yu Tian,Jiping Chen,Sheng Chen,Junpeng Zhang
Recently, EDTA-chelated Cd II (Cd II -EDTA) was effectively removed by sulfidated nanoscale zero-valent iron (S-nZVI). However, few studies have been performed to investigate the influence of co-existing ions and emerging contaminants (such as microplastics) on the performance of S-nZVI toward Cd II -EDTA, which is vital for the application of S-nZVI in practical wastewater treatment. In this study, the individual effects of different co-existing ions (NO 3 − , SO 4 2− , PO 4 3− , Mg 2+ , Cu 2+ , and Zn 2+ ) and polystyrene (PS) microplastics with different concentrations on the removal of Cd II -EDTA by S-nZVI were systematically investigated. The removal capacity of S-nZVI toward Cd II -EDTA fell in the range of 579.3–644.7, 612.3–670.2, 607.4–691.3, 533.3–623.6, 79.9–545.3, 544.3–631.7, and 568.6–663.8 mg/g for the presence of NO 3 − , SO 4 2− , PO 4 3− , Mg 2+ , Cu 2+ , Zn 2+ , and PS microplastics over the concentration range of 10.0–150.0 mg/L, respectively, which were all smaller than that of the system of Cd II -EDTA alone (746.6 mg/g), indicating that all of the investigated co-existing substances showed inhibitory effects on Cd II -EDTA removal. As for NO 3 − , SO 4 2− , or Mg 2+ -containing system, the inhibitory effect was ascribed to the influence of S-nZVI corrosion rate; As for PO 4 3− , Mg 2+ , Cu 2+ , Zn 2+ , or PS microplastics-containing system, the negative effect was caused by changing the corrosion of S-nZVI and occupying the reactive sites at the surface of S-nZVI. The final corrosion products of S-nZVI under different reaction conditions were strongly dependent on the species and concentration of co-existing substance with the combinations of γ-FeOOH, α-Fe 2 O 3 , FeO, or β-FeOOH as the dominant corrosion products.
研究领域:
环境科学
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化学工程
✓ 已验证
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2025
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IF 11.3
Yuetong Luo,Kaixing Fu,Dawei Wang,Jinming Luo
Nanobubbles (NBs) have been utilized to enhance the removal of perfluoroalkyl and polyfluoroalkyl substances (PFAS) from water. However, the effectiveness of NBs under various operational conditions, including varying PFAS concentrations, pH levels, and the presence of coexisting ions, has remained insufficiently explored. A deeper understanding of these interfacial interactions is crucial to optimizing and maximizing the efficiency of NBs in PFAS removal. This study aims to bridge these knowledge gaps by systematically exploring the role of NBs in augmenting the adsorption of legacy PFAS on various carbon-based adsorbents, including granular activated carbon (GAC), carbon nanotubes (CNTs), and graphene. Our experimental results demonstrated a significant improvement in PFAS adsorption on carbon-based adsorbents in the presence of NBs, with the enhancement effect particularly pronounced at a high initial PFAS concentration (50 mg L–1). Acidic conditions notably facilitated PFAS removal in the NB-assisted carbon adsorption system, aligning well with the predictions from the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. Furthermore, ionic strength was found to play a critical role, with lower levels stabilizing NBs and promoting interactions with adsorbent surfaces, while higher levels reduced the effectiveness of NBs. Additionally, multivalent cations (particularly Fe3+) showed a substantially greater enhancement in PFAS removal efficiency compared to Na+ and Ca2+. This study deepens the understanding of NB-assisted PFAS removal using carbon-based adsorbents and provides practical insights into optimizing treatment processes.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2012
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IF 3.461
Xiaoshu Lv,Yunjun Hu,Jie Tang,Tiantian Sheng,Guangming Jiang,Xinhua Xu
This study describes the chromium (VI) removal in aqueous solution by nanoscale zero-valent iron (nZVI)-Fe 3 O 4 nanocomposites, which were prepared by a novel in situ reduction method. The effects of several factors, including ionic strength, temperature, co-existing anions and cations and natural organic matters were evaluated. The ionic strength was found to be insignificant to the removal efficiency, while temperature was critical. With the increase in temperature from 10–40 °C, 32% removal efficiency increased within 2 h from 49.96%. Most anions hindered the reaction, especially in high concentration, such as HCO 3 - and PO 4 3 - , causing a drop of the removal efficiency from 66.48% to 57.47% and 59.93% respectively. In contrast, both cations and moderate natural organic matter facilitated the removal of Cr(VI). It is noteworthy that calcium hardness can greatly promote the reaction, 100% removal efficiency was achieved within 90 min and the rate constant k 2 reached 0.528 g mg −1 min −1 after adding 40 mg L −1 Ca 2+ , which was ten times more than that in other cases. Possible mechanism was presented, and TEM, SEM and FITR analyses were used to verify these speculations. Hopefully, these results can contribute to a better development of the water treatment facilitates for nZVI-Fe 3 O 4 composites, maintaining its high efficiency in real aqueous environment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ECOLOGICAL ENGINEERING
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2013
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IF 2.958
Shams Ali Baig,Tiantian Sheng,Yunjun Hu,Xiaoshu Lv,Xinhua Xu
In this study, adsorptive removal of arsenic in saturated sand filters (SSF(a) and SSF(b)) containing raw and iron-coated honeycomb briquette cinders (HBC and Fe-HBC) is presented. Operating parameters including SSF design, dissolved oxygen (DO), pH, iron leaching and the effects of co-occurring ions on arsenic removal were investigated at 23 ± 2.0 °C temperature for 24-days long treatment. Sampling times (ST) (5–120 min) during treatment days (TD) 1, 6, 12, 18 and 24 were purposively decided to assess filters’ performance from tap water with the spiked of 200 μg/L of As(V) and As(III) into SSF(a) and SSF(b), respectively. No other alteration or pH adjustment was made to the influent water. Results demonstrated that the removal efficiencies of arsenic in SSF(a) and SSF(b) were maintained >95% and >85% till TD-12 and than decreased to 78% and 60%, respectively, on TD-24. Lower arsenic removal in SSF(b) could be the result of As(III) slower oxidation at the studied influent pH under oxic conditions . Decreased in effluent DO and increased iron leaching were measured in both the filters from TD-1 to TD-24. Minor variations of effluents pH and co-occurring ions (Fluoride, Nitrate and Sulphate) were recorded, but no significant effect on arsenic removal was measured in the reported ranges. Performance of NaOH-regenerated filter-beds was evaluated and both filters removed 95% of arsenic in three-cycle treatments. This study suggests of an in situ treatment; by the oxidation of As(III) into As(V) in the presence of DO and hydroxyl radical on adsorbent surfaces, followed by subsequent adsorption through selective physical sorption and Fe-As complexation. SSF containing cost-effective adsorbents could be an effective in situ treatment option to conventional treatment for safe drinking water production .
研究领域:
环境科学
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水处理工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Siyi Wang,Junping Ma,Chen Wang,Wenke Xi,Yuxuan Bai,Wen Lu,Jianjun Wang
To effectively treat the contamination caused by radionuclide uranium (VI) in wastewater discharged from the nuclear industry, it is necessary to investigate novel nanomaterials with powerful adsorption capacities. In this study, a novel composite nanomaterial α-MnO 2 @CTS was successfully synthesized by coating nano manganese dioxide (α-MnO 2 ) with chitosan (CTS) using a straightforward method. The effects of the pH, ionic strength, presence of coexisting ions, time, temperature, cycle number and stability on U(VI) removal were investigated. The results showed that U(VI) elimination by α-MnO 2 @CTS was strongly dependent on the pH but weakly influenced by the NaNO 3 concentration, which indicated complexation on the inner-sphere surface. At pH = 6.0 ± 0.1 and T = 298 K, α-MnO 2 @CTS had an adsorption capacity of up to 326.54 mg/g toward U(VI), which was consistent with the results of a Langmuir adsorption isotherm model. In various studies, the high removal rate of U(VI) by α-MnO 2 @CTS has been attributed to electrostatic attraction, and hydroxyl and amide groups introduced by CTS are also considered to play a key role in the adsorption process. In conclusion, α-MnO 2 @CTS can efficiently and rapidly adsorb U(VI) under acidic conditions, indicating broad application prospects for radioactive wastewater treatment.
研究领域:
环境科学
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纳米技术
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放射性废物管理
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yi Liu,Dengjie Zhong,Yunlan Xu,Haixing Chang,Lin Dong,Zhuofan Han,Jun Li,Nianbing Zhong
The limited metal sites of monometallic MOFs and the high influence of pH limit their adsorption capacity. To solve these problems, La/Al bimetallic MOFs/chitosan composite was prepared by hydrothermal synthesis and impregnation methods and then characterized by XRD, FTIR, SEM, BET and XPS techniques. The doping of La has no obvious effect on the structure of Al-MOFs, but chitosan has greatly changed the structure of La/Al bimetallic MOFs. The phosphate adsorption of the composite was affected by La/Al molar ratio, chitosan/bimetallic MOFs mass ratio, temperature, phosphate initial concentration, adsorbent dosage, pH, and coexisting ions. The optimum molar ratio of La/Al and mass ratio of chitosan/bimetallic MOFs are 0.5:1 and 5.0%, respectively. The addition of La and chitosan can provide additional adsorption active sites, inhibit metal leaching, and enhance the phosphate adsorption performance, stability, and acid-alkali resistance of the composite. Its maximum adsorption capacity was 264.48 mg·g −1 . Its phosphate removal efficiency is above 90% at pH= 3.0–9.0. The actual phosphorus-containing wastewater with 7.064 mg·L −1 PO 4 3- and initial pH 7.4 can be treated to meet Chinese first-class effluent quality standard. La, Al, amino groups, and hydroxyl groups play an important role in the adsorption process of phosphate. When pH < pH pzc (4.99), phosphate is adsorbed by electrostatic gravitation between it and protonated positively charged amino and hydroxyl groups on La and Al, while when pH > pH pzc , phosphate is removed by ligand exchange between it and hydroxyl groups on La and Al. A stable, low-cost, and efficient bimetallic MOFs-based phosphate adsorbent was designed and prepared in this paper, and the results can provide reference for researchers in environmental chemical engineering .
研究领域:
环境化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Tao Ou,Yuhua Wu,Weixing Han,Lingjun Kong,Gang Song,Diyun Chen,Minhua Su
Halloysite nanotubes (HNTs) are considered structurally promising adsorption materials, but their application is limited due to their poor native adsorption properties. Improving the adsorption capacity of HNTs for radioactive U(VI) is of great significance. By controlling the mass ratio of HNTs and dopamine (DA), composite adsorbents ( [email protected] ) with different polydopamine (PDA) layer thicknesses were synthesized. Characterization of [email protected] demonstrated that the original structure of the HNTs was maintained. Adsorption experiments verified that the adsorption capacity of [email protected] for U(VI) was significantly improved. The effects of solution pH, temperature, and coexisting ions on the adsorption process were investigated. The removal efficiency was observed to be 75% after five repeated uses. The adsorption mechanism of U(VI) by [email protected] can be explained by considering electrostatic interactions and the complexation of C–O, –NH– and C–N/C N in the PDA layer. This study provides some basic information for the application of HNTs for U(VI) removal.
研究领域:
环境科学
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材料科学
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纳米技术
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放射性废物管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2022
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IF 4.778
Huixin Xiong,Bailin Zhang,Can Cui,Yiqun Xu
The synthesized polyaniline/FeOOH composite characterized by SEM, HRTEM, XRD , FT-IR and BET, was used as adsorbent for Acid Orange II (AOII). The kinetics, isotherm and thermodynamics of AOII adsorption by polyaniline/FeOOH were studied by batch experiments. And effects of pH and coexisting ions on AOII removals were also investigated. Adsorption kinetics and isotherm well fitted pseudo second-order kinetic model and Langmuir isotherm model, respectively. The maximum adsorption capacity of polyaniline/FeOOH for AOII could reach 155.8 mg g −1 . It showed that polyaniline/FeOOH composite could rapidly and efficiently remove AOII from aqueous solutions. In addition, thermodynamic result indicated that the adsorption was a spontaneous endothermic process. Removal ratio of AOII (100 mg/L) increased as pH decreased and could reach 98.6% at pH3. And anions coexisting in the solutions could inhibit the adsorption effect, while the cations have negligible influence. Also, PANI/FeOOH had better applicability to the different types of anionic dyes. The regeneration of polyaniline/FeOOH loading 98.6% of AOII evaluated for three cycles and there was about 70% of AOII loaded on final adsorbent.
研究领域:
环境科学
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材料科学
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物理化学
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水处理技术
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吸附科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）